Please show the steps

Section 2: Simple Programming Consider n buildings on a grid at positions 0 to n + 1. Each building has a height h;. You can arrange the buildings in any order but you must leave the slot at position 0 open. Imagine a laser is shot just below the roof and to left of a building. The laser travels any number of grid points until it encounters a building of the same height or taller or reaches the end of the grid, position 0. For example, consider 4 buildings of height 3, 3, 4, and 1 arranged at grid points 1, 2, 3, and 4, respectively. The laser travels 1,1,3, and 1 grid points for each of the buildings, respectively. Let's call the sum of the lasers' distances V. For this example, V = 6. For all questions, give your answer to 10 places after the decimal point